Fronius Robacta PTW 500 Instructions De Service page 39

Troubleshooting
Safety
An electric shock can be fatal.
Before carrying out any work on the welding torch:
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Troubleshooting
Pilot arc not igniting
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Copper droplets on the plasma nozzle after a short welding time
Droplet formation on the plasma nozzle is a sign that the plasma nozzle has been
badly damaged: the plasma nozzle has melted due to high temperatures and is
leaking.
Cause:
Remedy:
Excessive plasma nozzle wear
Cause:
Remedy:
WARNING!
Turn the mains switches of the power source and plasma device to the "0"
position
Disconnect the power source and plasma device from the mains
Put up an easy-to-understand warning sign to stop anybody inadvertently
switching them back on again
Tungsten electrode missing
Insert tungsten electrode
Plasma nozzle and tungsten electrode too far apart
Position tungsten electrode correctly
Plasma nozzle and tungsten electrode touching or too close (short
circuit between plasma nozzle and tungsten electrode)
Position tungsten electrode correctly
Loading values too high
Check the current and plasma gas flow rate, change the plasma nozz-
le, reduce the load
Insufficient cooling
Check the current and plasma gas flow rate, check the cooling cir-
cuit, increase the plasma gas flow rate, check for wear on the nozzle
connection
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